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@ai-billing/google
@ai-billing/google / createGoogleV3Middleware

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Function: createGoogleV3Middleware()

createGoogleV3Middleware<TTags>(options): LanguageModelV3Middleware
Defined in: google/src/ai-sdk/language-model-middleware/v3/language-model-v3-google-billing-middleware.ts:97 Creates a V3 billing middleware for the Google provider (@ai-sdk/google). Maps AI SDK usage into billing fields and resolves cost from pricing plus usage.

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Type Parameters

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TTags

TTags extends JSONObject The shape of the tags object, extending DefaultTags.

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Parameters

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options

GoogleV3MiddlewareOptions<TTags> Billing options; see GoogleV3MiddlewareOptions.

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Returns

LanguageModelV3Middleware A V3 billing middleware instance for Google.

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Example

Same wiring as examples/dev-sandbox/app/api/google (createGoogleV3Middleware is this function’s export alias from @ai-billing/google). 
import { createGoogleGenerativeAI } from '@ai-sdk/google';
import { wrapLanguageModel } from 'ai';
import { createGoogleV3Middleware } from '@ai-billing/google';
import {
  consoleDestination,
  createObjectPriceResolver,
  type ModelPricing,
} from '@ai-billing/core';

const google = createGoogleGenerativeAI({ apiKey: process.env.GOOGLE_AI_STUDIO_KEY });

const customPricingMap: Record<string, ModelPricing> = {
 'models/gemini-3.1-flash-lite-preview': {
   promptTokens: 0.00000025, // $0.25 per 1M tokens
   completionTokens: 0.0000015, // $1.50 per 1M tokens
   inputCacheReadTokens: 0.000000025, // $0.025 per 1M tokens
   internalReasoningTokens: 0.0000015, // $1.50 per 1M tokens
 },
};

const priceResolver = createObjectPriceResolver(customPricingMap);

const billingMiddleware = createGoogleV3Middleware({
  destinations: [consoleDestination()],
  priceResolver,
});

const wrappedModel = wrapLanguageModel({
  model: google('models/gemini-3.1-flash-lite-preview'),
  middleware: billingMiddleware,
});